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arXiv · 1301.7635

Current-field diagram of magnetic states of a surface spin valve in a point contact with a single ferromagnetic film

I. K. Yanson·O. P. Balkashin·V. V. Fisun·Yu. I. Yanson·Yu. G. Naidyuk
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Abstract

We present a study of the influence of an external magnetic field H and an electric current I on the spin-valve (SV) effect between a ferromagnetic thin film (F) and a sharp tip of a nonmagnetic metal (N). To explain our observations, we propose a model of a local surface SV which is formed in such a N/F contact. In this model, a ferromagnetic cluster at the N/F interface plays the role of the free layer in this SV. This cluster exhibits a larger coercive field than the bulk of the ferromagnetic film, presumably due to its nanoscale nature. Finally, we construct a magnetic state diagram of the surface SV as a function of I and H.

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I. K. Yanson, O. P. Balkashin, V. V. Fisun, Yu. I. Yanson, Yu. G. Naidyuk. 2013-01-31. Current-field diagram of magnetic states of a surface spin valve in a point contact with a single ferromagnetic film. https://doi.org/10.1063/1.4795199

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